US3926073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmissions with planetary gears having a braking mechanism capable of being pre-assembled
Assignee: Renault SA
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Filing: 1974-01-31
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Granted: 1975-12-16
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Expires: 1994-01-31
Abstract
Abstract An automatic transmission having a planetary gear train includes a housing with coaxially disposed brake mechanisms controlled by spring-biased hydraulic pistons for actuating the braking means associated with the elements of the planetary gear train. A portion of the brake casing projects radially inwardly towards the longitudinal axis of the casing so as to form a supporting surface for the brake friction discs, the periphery of the casing also being provided with means for securing the same to the transmission housing as well as to a bulkhead for supporting the braking devices. The inner walls of the casing also provide seats for the piston return springs which are interposed between the projecting portion of the casing and radially extending portions of the pistons.
Inventors
- 👤 Jean Claude Roche
- 👤 Martial Lavarec
- 👤 Jean Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:12
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/08; F16H57/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
An automatic transmission having a planetary gear train and braking and clutching mechanisms associated with the elements of the planetary gear train comprising: a housing; coaxially disposed means provided within said housing, hydraulically controlled by means of spring biased pistons, for actuating said braking and clutching mechanisms for said elements of said planetary gear train; a bulkhead forming the bearing for a free wheel and connected to said housing; channel means for the distribution of hydraulic fluid to said braking mechanisms; a brake casing fixed to said bulkhead; and friction discs disposed within said casing, said casing including a single portion projecting radially inwardly towards the longitudinal axis thereof so as to form a supporting surface for said friction discs, and wherein the periphery of said casing includes first means for securing said casing to said housing and second means for securing said casing to said bulkhead, internal wall portions of said casing forming seat means for said piston springs which are secured between said single radially inward portion of said casing and radially extending portion of said pistons.
Claim 2
Dependent Claim
179 words
An automatic transmission having a planetary gear train and braking and clutching mechanisms associated with the elements of the planetary gear train comprising: a housing; coaxially disposed means provided within said housing, hydraulically controlled by means of spring biased pistons, for actuating said braking and clutching mechanisms for said elements of said planetary gear train; a bulkhead forming the bearing for a free wheel and connected to said housing; channel means for the distribution of hydraulic fluid to said braking mechanisms; a brake casing fixed to said bulkhead; and friction discs disposed within said casing, said casing including a single portion projecting radially inwardly towards the longitudinal axis thereof so as to form a supporting surface for said friction discs, and wherein the periphery of said casing includes first means for securing said casing to said housing and second means for securing said casing to said bulkhead, internal wall portions of said casing forming seat means for said piston springs which are secured between said single radially inward portion of said casing and radially extending portion of said pistons.
Claim 3
Dependent Claim
64 words
The automatic transmission as set forth in claim 1, wherein said first securing means of said casing comprises: lugs which are adapted to fit within corresponding recesses provided within said housing; said lugs extending axially along said casing so as to define said seat means for said piston springs; and wherein said lugs have at least one bore for receiving said second securing means.
Claim 4
Dependent Claim
26 words
The automatic transmission as set forth in claim 1, wherein the cylinders associated with said pistons are formed within an annular member secured to said bulkhead.
Claim 5
Dependent Claim
41 words
The automatic transmission as set forth in claim 3 wherein said annular member is provided with cylinder means such that said cylinders extend from opposite sides of said bulkhead whereby said brakes constitute, along with said annular member, a pre-assembled unit.
References Cited (Backward Citations)
US2518824A
Cited
US2930258A
Cited
US3602055A
Cited
US3656372A
Cited
US3803948A
Cited
US3780601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |